Many people around here know that I like the klipsch stuff especially for movies and such, but I don't care even a little bit for the synergy stuff. If you're gonna use klipsch, make sure it has an "R" in its name (reference series). You can find the RB-10 fairly cheap. It will destroy the synergy line. The reference series uses much better crossover components and the tweeter is much much better.
At the end of the day, they are just surround speakers and a lot of folks will argue that they aren't that big a deal, but if you can get the rb10's you'll be much happier.